erc20 airdrop

Smart Contract programming language soliditySolidity is the first language to describe smart contracts. Currently is the most popular language, so there are also the most examples, documentation, and tutorials. You should learn this, unless you have to learn other reasons.You can use the browser-based remix IDE for quick validation.The following is a solidity contract:pragma solidity^0.4.11;Contract Basictoken{ Mapping(Address=uint256) Balances; function Transfer(Address _to,uint256 _val

package all the parameters of the function together, eating up to 1 bytes of the amount parameter's high. (5) The three parameters are passed into the msg.data, and then the transfer method of the contract is invoked, at which point amount is eaten by 1 bytes of the high position, so amount = Amount 0x03 summed up to this loophole, to tell the truth, Ether has an unshirkable responsibility, because the EVM does not strictly verify the number of addresses, and also automatically add to disappear

Server, is also a centralized structure. Dapp does not entirely mean that its development is to be centralized, but that its operation is to be centralized. At present the most successful Dapp is cryptokitties, that is, the cat game. The online game once caused a serious blockage of the Ethereum network. According to the state of the Dapps website, there are currently 977 Dapp based on Ethereum. Interested readers may wish to search and see. 0x04 Practice If you want to learn about smart contra

= { //See Using zeppelin-solidity to simplify the development process of crypto wallet NPM Install Zeppelin-solidityCreate a new contract file for a currency. Example: The new Guicoin.sol content under the contracts directory is as follows: pragma solidity ^0.4.4; Import "Zeppelin-solidity/contracts/token/erc20/standardtoken.sol"; Contract Guicoin is standardtoken { string public name = "Guicoin";//Currency name string Public symbol = "GC";

volume of large applications, this type of application power is very large, when the use of low power will not only make the phone quickly dry power consumption, the battery life has also affected. Use with charge With the use of charging means that as long as the consumption of electricity, you can plug in the charger at any time, do not tangle to high or low electricity. The current lithium-ion technology is very mature, fully can be used with the charge, so that the maximum battery life ca

IOS8 continues to use the minimalist flat style of iOS7, which is virtually indistinguishable from the graphical interface. As you can see, the overall appearance, or the system comes with the application icon, are similar to the IOS7 system. 2. On the iOS8 there are some improvements to the original function, here first talk about the SMS function. When you receive a text message on the IOS7 system, you need to click to open the SMS Application screen before you can reply. In this regard,

interface. Maybe Apple doesn't want to see a file-sharing feature beyond their control, which is not the same as the original iOS design. If you don't use Uiactivityviewcontroller, you may not be able to install AirDrop functionality in your app.MapApple continues to explore the application of maps, and Mapkit's improvements have been lackluster. I've always believed that the bottleneck of map-class applications must be data, but the creation of a da

is set up to use Twitter o R Facebook), it'll show your text, and attach the URL in whatever to be appropriate for that social media choice. if you use a Message or copy it to the pasteboard, you should get something similar to "Look in this awesome website f or aspiring IOS developers! http://www.codingexplorer.com/". I'll probably update this post as I learn more about Uiactivityviewcontroller. I hope you found this article helpful. If you do, don ' t hesitate to share this post on Twitter or

The new iOS 8.0.1 upgrade file will "soon" be available to users, according to a foreign technology website that has been iOS8 and repaired for problems with the company. In addition to some of the problems, Apple also fixes a problem with airdrop support for passbook in the new patch package, and a VPN file installation.The earliest discussion about the iOS 8.0.1 began earlier this month, before the release time of iOS 8. This is not unusual, given t

There are a few common ways that you might want to share content across apps on the iOS platform:The first is to realize the sharing of documents and data between apps of different devices through airdrop;The second is to define a URL scheme for each app that accesses an app directly by accessing a URL that specifies a URL scheme;The third is to send data, share data, and manipulate data between apps through Uidocumentinteractioncontroller or Uiactivi

PrefaceThere are several common ways we want to share content between different apps on the iOS platform: A passage AirDrop in English realize the sharing of documents and data between applications of different devices; The second is to define a URL scheme for each application that accesses an app directly by accessing a URL that specifies a URL scheme; Third Kind is through UIDocumentInteractionController or a UIActivityViewControll

(5_0), the operation will appear, " presenting view controllers on detached view controllers is Discouraged "the problem. Thought BVC had been present to AVC, so once again there will be errors. can use [Self.view.window.rootViewController presentviewcontroller:imagepicker animated:yes completion:^{ NSLog (@ "finished");

standard Uiactivityviewcontroller, and no separate API is provided. Data, it can be sent by implementing the Uiactivityitemsource interface. Maybe Apple doesn't want to see a file-sharing feature beyond their control, which is not the same as the original iOS design. If you don't use Uiactivityviewcontroller, you may not be able to install AirDrop functionality in your app.MapApple continues to explore the application of maps, and Mapkit's improvemen

with ns_extension_unavailable and some frameworks such as health kit, Event kit are not available; Cannot get camera, microphone; Cannot run background tasks for long periods of time; Data cannot be obtained through airdrop, but data can be sent to airdrop; The above is a general question about today's extension, and there are some high-end situations, such as increasing the refresh height

What is Multipeer Connectivity?In IOS7, a new framework--multipeer Connectivity (multipoint connection) is introduced. With the Multipeer connectivity framework, even when there is no connection to WiFi (Wi-Fi) or mobile network (XG), the proximity of Apple devices (Imac/ipad/iphone) can be based on Bluetooth and WiFi (peer WiFi) technology for discovery and connectivity for near field communication.The Multipeer connectivity expansion function is very similar to the use of

interface elements. The notification center also adopts this design and provides a brand new control center. Control Center.Slide from the bottom to pull out. Quickly switch flight mode, adjust wi-fi, Bluetooth, no interference mode, flashlight, alarm clock, calculator, camera, music playback control. Enable AirPlay for AirDrop wireless transmission. Like the notification center, it can be called everywhere, including unlocking screens. AirDrop.First

install the AirDrop function in the application.MapApple continues to explore the map app. Mapkit's improvements are also lackluster. I have always believed that the bottleneck of the map class application must be the data, but the establishment of the data source is not completed in two years. Google in this piece with its own search engine has a unique advantage. The apples are still very far away.Let's see what new things are: Mkmapcamera

The first thing to note is that this article is based on iOS8. If your iphone is not a iOS8 version, then this optimization tutorial may not be very significant, you can expect a small series of follow-up for other versions of the iphone to bring optimization tutorials OH. Apple has added a lot of new features to the iOS8, and some of these new features are useless, not only useless, but also power-hungry, slowing down the iphone's speed. So, this iphone optimization tutorial revolves a

wait until the day when Apple comes up with a price cut. Cost: RMB 588 x2=1176 (usb-c VGA multi-port connector, USB-C digital AV multiple port connector) 5, do not need to connect the iphone, do not need a projector, do not need a projector, do not need anything If you have been accustomed to full cloud operations, do not need a U disk, hard disk, the iphone is also maintained in the best power, to upload data directly through icloud, AirDrop

only one Genesis block): Next, we'll send some POST requests via POSTMAN: Refresh the page just now, there are a few more blocks in the chain, exactly what we just generated, and you can see that the order and hash values of the blocks are correct. Next We have just completed a block chain of our own, although very simple (the burrow), but it has block generation, hash calculation, block check and other basic capabilities. You can then continue to learn more about other important chunks o